[Contents]
[Prev]
[Next]
[Index]
[Report an Error]
Optional
Tasks
The following configuration tasks are optional
for T3 and E3 interfaces:
- Specify the cable length (T3 only).
- Change the clock source.
- Change the framing format.
- Enable cell scrambling (ATM interfaces only).
- Assign a text description or an alias to the interface.
cablelength
- Use to adjust the transmit power appropriate to the length
of a T3 cable.
- Specify a cable length in the range 1–450 feet.
- The router supports two transmit powers, one for a cable
length between 1–225 feet and another for a cable length between
226–450 feet. Therefore, it is not necessary to know the exact
size of your cable. You only need to know if the cable size is greater
than 225 feet. For example, if your cable size exceeds 225 feet, specify
any number greater than 225 and less than 451.
- Example
- host1(config-controll)#cablelength 300
- Use the no version to restore
the default, 0 feet.
- See cablelength.
clock source
- Use to configure the transmit clock source for a T3 or
E3 line.
- Use a transmit clock on the line’s receive data
stream, except in rare cases such as back-to-back router tests. When
performing back-to-back router tests, configure one end of the line
as internal and the other end as line.
- Specify the keyword line to
use a transmit clock on the line’s receive data stream.
- Specify the keywords internal module to use the line module’s internal clock.
- Specify the keywords internal chassis to use the router’s clock.
- Example
- host1(config-controll)#clock source internal
module
- Use the no version to revert
to the default, line.
- See clock source.
description
- Use to assign a text description or an alias to a T3 or
E3 interface.
- You can use this command to help you identify the interface
and keep track of interface connections.
- The description or alias can be a maximum of 80 characters.
- Use show controllers t3 or show controllers e3 to display the text description.
- Example
- host1(config-controll)#description westford
t3 interface
- Use the no version to remove
the text description or alias.
- See description.
ds3-scramble
- Use to enable cell scrambling in a T3 ATM interface.
- Example
- host1(config-controll)#ds3-scramble
- Use the no version to turn
off cell scrambling on the interface.
- See ds3-scramble.
e3-scramble
- Use to enable cell scrambling in an E3 ATM interface.
- Example
- host1(config-controll)#e3-scramble
- Use the no version to turn
off cell scrambling on the interface.
- See e3-scramble.
framing
- Use to configure the framing format for a T3 or E3 line.
- For a T3 line, you must specify one of the following:
- T3 FRAME—c-bit or m23 (the default is c-bit)
- T3 ATM—cbitadm, cbitplcp, m23adm, or M23plcp (the default is cbitplcp)
- For an E3 line, you must specify one of the following:
- E3 FRAME—g751 or g832 (the default is g751)
- Choose a framing format that is compatible with the framing
format of the network device at the other end of the line.
- Example
- host1(config-controll)#framing m23
- Use the no version to restore
the default value.
- See framing.
[Contents]
[Prev]
[Next]
[Index]
[Report an Error]
